反应详情

温度

70 °C

A round bottom flask was charged with 4-chloro-2-methylbenzoic acid (200 mg, 0.001 mol) and sulfuric acid (1 mL, 0.02 mol). Fuming nitric acid (0.05 mL, 0.001 mol) was added at −20° C. and the reaction was stirred for 1 hour at 70° C. and poured into ice cold water wherein the mixture of 2- and 4-nitro compounds precipitated out. The precipitate was filtered and dissolved in ethylacetate (30 mL) and washed with saturated aqueous sodium bicarbonate solution, brine and dried over sodium sulfate. The solvent was reduced ¼ volume whereby the undesired isomer precipitated out. The precipitate was filtered and the filtrate was dried to obtain a 1:1 mixture of isomers as a white solid. MS m/z=214.5 (M−H).

1. additionpoured into ice cold water wherein
2. customprecipitated out
3. filtrationThe precipitate was filtered
4. dissolutiondissolved in ethylacetate (30 mL)
5. washwashed with saturated aqueous sodium bicarbonate solution, brine
6. dry with materialdried over sodium sulfate
7. customprecipitated out
8. filtrationThe precipitate was filtered
9. customthe filtrate was dried
10. customto obtain
11. additiona 1:1 mixture of isomers as a white solid